This series patches refine pci-imx6 driver and do the following main changes. - Encapsulate the clock enable into one standalone function - Add the error propagation from host_init and resume - Turn off regulator when the system is in suspend mode - Let the probe successfully when link never comes up - Do not hide the phy driver callbacks in core reset and clk_enable. - Keep symmetric as much as possible between suspend and resume callbacks. BTW, this series are verified on i.MX8MM EVK board when one NVME is used. Main changes from v13 to v14 refer to Bjorn's comments: - To keep suspend/resume symmetric as much as possible. Create imx6_pcie_stop_link() and imx6_pcie_host_exit() functions, and invoke them in suspend callback. - Since the imx6_pcie_clk_disable() is invoked by imx6_pcie_host_exit(), to be symmetric with imx6_pcie_host_exit(), move imx6_pcie_clk_enable() to imx6_pcie_host_init() from imx6_pcie_deassert_core_reset(). Main changes from v12 to v13: - Call imx6_pcie_host_init() instead of duplicating codes in resume. - Move the regulator enable out of imx6_pcie_deassert_core_reset(). Re-format the error handling in imx6_pcie_deassert_core_reset() and imx6_pcie_host_init() accordingly. Main changes from v11 to v12 issued by Bjorn: - Add four intro patches to move code around to collect similar things (PHY management, reset management) together. This makes the first diff to collect clock enables simpler because it's not cluttered with unrelated things that didn't actually change. - Factor out ref clock disables so the disable function structure matches the enable structure. - Drop unused "ret" from "Reduce resume time ..." to avoid bisection hole, then add it back in "Do not hide phy driver ..." where we start using it again. - Add patch to make imx6_pcie_clk_disable() symmetric with imx6_pcie_clk_enable() in terms of enable/disable ordering. Main changes from v10 to v11: No code changes, just do the following operations refer to Bjorn's comments. - Split #6 patch into two patches. - Rebase to v5.19-rc1 based on for-next branch of Shawn's git. Main changes from v9 to v10: - Add the "Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>" tag into #3 and #4 patches. - Refer to Bjorn's comments: - refine the commit of the first patch - keep alignment of the message format in the second patch - More specific commit and subject of the #5 and #7 patches. - Move the regualtor_disable into suspend, turn off the regulator when bus is powered off and system in suspend mode. - Let the driver probe successfully, return zero in imx6_pcie_start_link() when PCIe link is down. In this link down scenario, only start the PCIe link training in resume when the link is up before system suspend to avoid the long latency in the link training period. - Don't hide phy driver callbacks in core reset and clk_enable, and refine the error handling accordingly. - Drop the #8 patch of v9 series, since the clocks and powers are not gated off anymore when link is down. Main changes from v8 to v9: - Don't change pcie-designware codes, and do the error exit process only in pci-imx6 driver internally. - Move the phy driver callbacks to the proper places Main changes from v7 to v8: Regarding Bjorn's review comments. - Align the format of the dev_info message and refine commit log of #6/7/8 patches. - Rename the err_reset_phy label, since there is no PHY reset in the out Main changes from v6 to v7: - Keep the regulator usage counter balance in the #5 patch of v6 series. Main changes from v5 to v6: - Refer to the following discussion with Fabio, fix the dump by his patch. https://patchwork.kernel.org/project/linux-pci/patch/1641368602-20401-6-git-send-email-hongxing.zhu@xxxxxxx/ Refine and rebase this patch-set after Fabio' dump fix patch is merged. - Add one new #4 patch to disable i.MX6QDL REF clock too when disable clocks - Split the regulator refine codes into one standalone patch #5 in this version. Main changes from v4 to v5: - Since i.MX8MM PCIe support had been merged. Based on Lorenzo's git repos, resend the patch-set after rebase. Main changes from v3 to v4: - Regarding Mark's comments, delete the regulator_is_enabled() check. - Squash #3 and #6 of v3 patch into #5 patch of v4 set. Main changes from v2 to v3: - Add "Reviewed-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>" tag into first two patches. - Add a Fixes tag into #3 patch. - Split the #4 of v2 to two patches, one is clock disable codes move, the other one is the acutal clock unbalance fix. - Add a new host_exit() callback into dw_pcie_host_ops, then it could be invoked to handle the unbalance issue in the error handling after host_init() function when link is down. - Add a new host_exit() callback for i.MX PCIe driver to handle this case in the error handling after host_init. Main changes from v1 to v2: Regarding Lucas' comments. - Move the placement of the new imx6_pcie_clk_enable() to avoid the forward declarition. - Seperate the second patch of v1 patch-set to three patches. - Use the module_param to replace the kernel command line. Regarding Bjorn's comments: - Use the cover-letter for a multi-patch series. - Correct the subject line, and refine the commit logs. For example, remove the timestamp of the logs. Bjorn Helgaas (5): PCI: imx6: Move imx6_pcie_grp_offset(), imx6_pcie_configure_type() earlier PCI: imx6: Move PHY management functions together PCI: imx6: Move imx6_pcie_enable_ref_clk() earlier PCI: imx6: Factor out ref clock disable to match enable PCI: imx6: Disable clocks in reverse order of enable Richard Zhu (12): PCI: imx6: Move imx6_pcie_clk_disable() earlier PCI: imx6: Collect clock enables in imx6_pcie_clk_enable() PCI: imx6: Propagate .host_init() errors to caller PCI: imx6: Disable i.MX6QDL clock when disabling ref clocks PCI: imx6: Call host init function directly in resume PCI: imx6: Turn off regulator when system is in suspend mode PCI: imx6: Move regulator enable out of imx6_pcie_deassert_core_reset() PCI: imx6: Mark the link down as non-fatal error PCI: imx6: Reduce resume time by only starting link if it was up before suspend PCI: imx6: Do not hide phy driver callbacks and refine the error handling PCI: imx6: Reformat suspend callback to keep symmetric with resume PCI: imx6: Move the imx6_pcie_ltssm_disable() earlier drivers/pci/controller/dwc/pci-imx6.c | 661 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++----------------------------------------------------------------------------------------------- 1 file changed, 358 insertions(+), 303 deletions(-)
